Nettles. Great for a hair rinse, at least according to Aunt; good as soup apparently; and nice tea; but up close and personal in the raw state, no. Nowhere near as bad as the poison ivy across the pond, which is Nature in a Very Bad Mood, but nonetheless, not to be messed with. So we walked back and forth through holes in the fence, bypassing the things, and finally emerging illegally into the next field.
Sidestepping the end of the path was a necessity rather than an option. Nature had achieved a fine and very effective barrier across the legal way.